Martin wrote:>>>Evidently hydra, planaria, and the like were more of a problem in Innes'
day when filtration was fairly primitive. I remember I had one tank
(containing an african lungfish) which became infested with a swarm of
swirling little bugs, some of which attached themselves to the fish. When
I looked a them under a dissecting scope they looked like little clams with
feet hanging out. Something jogged my memory and I opened one of my
various editions of Innes and there it was - Cypris. How often do you hear
of that one any more?<<<

Jan writes:
Another contributing factor was the use of wild-caught live foods and
plants. Early editions of Exotic Aquarium Fishes had fairly-detailed
sections on the collection of live foods including Daphnia, tubifex,
mosquitos, etc.. I am guessing that this was a more common practice in the
40s than it has been in recent years. Innes, by the way, says that hydra are
introduced accidentally with Daphnia - not surpising since hydra also have
some planktonic behaviors.
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